I am lucky that I do not have to do installation on the houses, although it is a very nice job that requires thinking. What to cram the wires, with so many professionals on the market, try to push the price with furrows - space. The chasing machine alone, I don't remember anything about PLN 2,000 net plus a vacuum cleaner roughly the same, this is not a shocking cost. Wanting to respect the vacuum cleaner, bags around 20 PLN / pcs, my worked-out De Walt works sporadically, recently at the renovation of my apartment, but since he is already 7 years old, it doesn't hurt, he works bagless. As for wall chasers - I have a Bosch, heavy shit and the shields are 150 mm, where they are relatively expensive (about 80 PLN / pcs) - I bought segmented 125 mm for 15 PLN, they cut the same, only to a smaller depth ...
For colleagues performing the installation I recommend a Bosch attachment with crumbling (sorry for spelling mistakes) which can be attached to an angle grinder. I have one, I had to tune it a bit, because it was Bosch, not De Walt, and in most cases we have such machines. Option w / w much cheaper and muchooo less hands hurt when cutting out.
As for the plasters - gypsum plasters, maybe something has changed, because I do not do internal installations anymore, but as I did it only a developer. Virtually 95 percent of private investors - cement and lime plasters.
Pozdr.